Fermi 亮耀变体的能谱分布
宇宙学与河外天体物理
2014-11-20 v1
摘要
（节选）我们对 Fermi LAT 亮 AGN 样本（LBAS）中由 γ 射线选取的耀变体的宽波段光谱性质进行了详细研究。通过将我们准确估计的 Fermi γ 射线谱与在 LBAS 数据采集期三个月内收集的 Swift、射电、红外、光学及其他硬 X 射线/γ 射线数据相结合，我们成功为 48 个 LBAS 耀变体组装了高质量且准同时的能谱分布（SED）。这些 γ 射线源的 SED 与在其他波长发现的耀变体的 SED 相似，在通常的 Log - Log F 表示中，清楚地展示了通常归因于低能同步辐射及随后一个或多个成分的逆康普顿辐射组合的典型宽波段光谱特征。我们利用这些 SED 来表征低能和高能成分的峰值强度。该结果已被用于推导经验关系，即根据宽波段颜色（即射电到光学和光学到 X 射线的谱斜率）以及 γ 射线谱指数来估计两个峰的位置。我们的数据显示，在宽线 FSRQ 中，同步辐射峰值频率 位于 10 至 10 Hz 之间，而在无特征的 BL Lacertae 天体中，位于 至 Hz 之间。我们发现 γ 射线谱斜率与同步辐射峰值能量和 X 射线谱指数强相关，这与同步辐射-逆康普顿情景下的一阶预期一致。然而，简单的均匀单区同步自康普顿（SSC）模型无法解释我们的大部分 SED，尤其是在 FSRQ 和低能峰（LBL）BL Lac 天体的情况下。(...)
引用
@article{arxiv.0912.2040,
title = {The Spectral Energy Distribution of Fermi bright blazars},
author = {A. A. Abdo and M. Ackermann and M. Ajello and M. Axelsson and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and B. M. Baughman and K. Bechtol and R. Bellazzini and B. Berenji and R. D. Blandford and E. D. Bloom and E. Bonamente and A. Borgland and J. Bregeon and A. Brez and M. Brigida and P. Bruel and T. H. Burnett and S. Buson and G. A. Caliandro and R. A. Cameron and P. A. Caraveo and J. M. Casandjian and E. Cavazzuti and C. Cecchi and O. Celik and E. Charles and S. Chaty and A. Chekhtman and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and S. Colafrancesco and L. R. Cominsky and J. Conrad and L. Costamante and S. Cutini and C. D. Dermer and A. de Angelis and F. de Palma and S. W. Digel and E. do Couto e Silva and P. S. Drell and R. Dubois and D. Dumora and C. Farnier and C. Favuzzi and S. J. Fegan and W. B. Focke and P. Fortin and M. Frailis and L. Fuhrmann and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and B. Giebels and N. Giglietto and P. Giommi and F. Giordano and T. Glanzman and G. Godfrey and I. A. Grenier and J. E. Grove and L. Guillemot and S. Guiriec and D. Hadasch and Y. Hanabata and A. K. Harding and M. Hayashida and E. Hays and S. E. Healey and D. Horan and R. E. Hughes and R. Itoh and M. S. Jackson and G. Johannesson and A. S. Johnson and W. N. Johnson and M. Kadler and T. Kamae and H. Katagiri and J. Kataoka and N. Kawai and M. Kerr and J. Knodlseder and M. L. Kocian and M. Kuss and J. Lande and L. Latronico and F. Longo and F. Loparco and B. Lott and M. N. Lovellette and P. Lubrano and G. M. Madejski and A. Makeev and W. Max-Moerbeck and M. N. Mazziotta and W. McConville and J. E. McEnery and C. Meurer and P. F. Michelson},
journal= {arXiv preprint arXiv:0912.2040},
year = {2014}
}
备注
85 pages, 38 figures, submitted to ApJ